Okay, I don't mean to scold...but I'm probably about to. Yes, she could have been digging to lay eggs, or in pre-nesting behavior. Ten months old is way too young to be breeding, health-wise. If she does lay, you will need to provide the extra nutrients (mostly calcium and protien) that were depleted from her body in the production of eggs. She will also need extra fluids available. Breeding is hard on a female. You also need to keep an eye on her to make sure she does not become egg-bound (a stuck egg).
The other possiblities are: She was just digging to dig (they do enjoy it) and caused an avalanche. Get her a sandbox to play in or she'll do it again. Or, she is intimidated or bothered by the male and was trying to hide. Male dragons are incorrigible. He will bother her to no end and this is very stressful.
In any case (here comes the scold) please separate them ASAP! Yes, it's a pain to maintain two houses, but here's the deal: Males and females should only be placed together for the act of breeding. Males are obnoxious (no offense) when they are in the mood to breed (which is always) and can literally try to breed a female to death. No ability to retreat from his attentions makes the female stressed, which can cause health problems and underfeeding. He may also harm her physically--her lack of interest won't mean he won't keep trying and they do bite during copulation. If she tries to get away while he is clamped on she may be injured. *He* may also suffer injury to the hemipenes if she bolts during copulation. Also, as I mentioned, she is not mature enough herself to have the resources to be making eggs OR to make eggs that are likely to produce optimally healthy babies. It sounds cold, but if she does lay, I would discard them. IF you plan to breed in the future, you'll have more success when she is in her full growth and health. Please separate them, for her sake. Please accept this in the spirit in which it is intended--the best interests of your dragons!
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4.3 Bearded Dragons (Rescues)
1.0 Corn snake (Rescue)
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4.5 Royal (Ball) Pythons (3 rescues)
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No, it's NOT a big house